//0x4 bytes (sizeof)
union _HEAP_LFH_BLOCK_LIST
{
    struct
    {
        USHORT Next;                                                        //0x0
        USHORT Count;                                                       //0x2
    };
    struct _HEAP_LFH_BLOCK_SLIST SList;                                     //0x0
    ULONG ListFields;                                                       //0x0
};